/* 公共样式 */
body {
    margin: 0;
    padding: 0;
    font-family: PingFang SC,helvetica neue,tahoma,microsoft yahei,arial,hiragino sans gb,sans-serif;
}
div,li,h1,h2,h3,h4,h5,label,li,ul {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a {
    text-decoration: none;
}
ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
p{
    margin: 0;
}
.fr {
    float: right;
}
.fl {
    float: left;
}
.content {
    width: 1200px;
    margin: 0 auto;
}
/* 导航栏部分 */